docs(forms): Add FormRecord class to API summary

[jroxbury]

Add the missing FormRecord class to the Reactive forms API summary which is located under Developer Guides -> Forms -> Reactive Forms.

Fixes #47808

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• [x] The commit message follows our guidelines: https://github.com/angular/angular/blob/main/CONTRIBUTING.md#commit
• [ ] Tests for the changes have been added (for bug fixes / features)
• [x] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• [ ] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, local variables)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [x] Documentation content changes
• [ ] angular.io application / infrastructure changes
• [ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

• [ ] Yes
• [x] No

Other information

[Mirage1348]

Eksik FormRecord sınıfını, Geliştirici Kılavuzları -> Formlar -> Reaktif Formlar altında bulunan Reaktif formlar API özetine ekleyin.

Düzeltmeler #47808

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• [x] Taahhüt mesajı yönergelerimize uygundur: https://github.com/angular/angular/blob/main/CONTRIBUTING.md#commit
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Halkla İlişkiler Tipi

Bu PR nasıl bir değişiklik getiriyor?

• [ ] hata düzeltme
• [ ] Feature
• [ ] Code style update (formatting, local variables)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [x] Documentation content changes
• [ ] angular.io application / infrastructure changes
• [ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

• [ ] Yes
• [x] No

Other information

[dylhunn]

Thanks @jroxbury!

[dylhunn]

This PR was merged into the repository by commit 29b198f0c9a63ae9b18f9e590e1fdca1af0f03e1.

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